Numerical Analysis Of Basalt Fiber-reinforced High-viscosity Asphalt Deck For Concrete Bridge

In order to further promote the application of basalt fiber-reinforced high-viscosity asphalt mixture in pavement engineering, the research of long-life asphalt deck on bridge was conducted. In this dissertation, the author conducted the finite numerical analysis on the asphalt deck supported-continuous T-beam cement concrete bridge based on the practical project. According to the global-local analysis thought, the distribution law of internal stress and strain of deck under the vehicle load locations was analyzed by building the three-dimensional model of bridge structure and partial beam-segment submodel. The effects of structure style of bridge, material parameters of deck layers and the different bonding states of interface on the mechanics response of deck overlays were discussed. Then the high-temperature viscoelasticity response of basalt fiber-reinforced high-viscosity asphalt deck overlays was obtained with laboratory tests on the basis of temperature field analysis.First, Midas/civil software was used to build the spatial grillage model of bridge structure to complete the global analysis with the effects of the overall deformation and dynamic characteristics of simply supported-continuous T-beam bridge on asphalt deck taken into consideration. Then the overall deformation of bridge structure, the stress distribution of beam-segments at support and midspan positions and the most unfavorable load locations were acquired under the comprehensive effects of the secondary dead load, the temperature load and the shock-effect vechicle load.Secondly, the finite element software ABAQUS was been applied to research the mechanics response of the basalt fiber-reinforced high-viscosity asphalt deck three-dimensional model. The distribution of transverse and longitudinal tensile stress-strain and shearing stress under the load locations along the thickness direction of the continuous system of asphalt deck overlay with the submodel method. And then the parameter sensitivity analysis about the thickness and modulus of asphalt deck was conducted. In addition, the cohesive interaction was used to simulate the sliding system of asphalt deck overlays in consideration of the stress damage of interface bonding material.Thirdly, T-beam two-dimensional model was build to analyze the steady-state heat conduction of asphalt deck in24hours according to the summer meteorological data at the project site. The change law of internal temperature in asphalt deck along with the time was analyzed. Then the influence of heat conductivity, specific heat and thickness of asphalt deck on temperature field was discussed. In this research, the influence factors of solar radiation, earth radiation and air convection were considered in the same time.Lastly, the essential parameters of the general Maxwell model at various temperatures were obtained by fitting according to the creep test data of SMA-13basalt fiber-reinforced high-viscosity asphalt mixture. The mechanics response of deck overlays under cyclic load was calculated by the two-dimensional finite element model. Then the variation law of the maximum values of deflection and creep deformation under peak load were obtained.